From: Axel Etzold <AEtzold@...>
Date: 2007-11-16T19:51:43+09:00
Subject: Questions about TCPSocket

Dear all,

I am trying to use Ruby bindings of a software that does
computations by exchanging messages between competent code.
The details are explained here:

http://www.math.kobe-u.ac.jp/OpenXM/1.2.1/html/OpenXM-en/OpenXM/node5.html

This software can be used from the command line and there, it works as
expected.
Now, I'd like to use it from ruby. There are ruby binding scripts.
However, I encounter some problems when initialising
TCPSocket - I can't get any connection. Both ruby and OpenXM are
installed on the same computer.
What could be the problem ?

Thank you very much,

Best regards,

Axel 



require "socket"
<snip>
</snip>
class OXSession
  def initialize(host = "localhost",
		 controlport = rand(20000)+1024,
		 dataport = controlport+1,
		 byteorder = 0)
    @serial = 0
    begin
      printf("Connecting to %s, \n", host)
      printf("Trying to connect to controlport %d, \n", controlport)
      @controlp = TCPSocket.new(host, controlport)
      sleep 2
      printf("Trying to connect to dataport %d, \n", dataport)
      @datap = TCPSocket.new(host, dataport)
      sleep 2
    rescue
       p 'could not connect'
    end
    
    # byte oder negotiation
    @byteorder = decide_byte_order(byteorder)
  end

  attr_accessor :controlp, :datap

  def decide_byte_order(b_or_l)
    if b_or_l == 0
      @controlp.read(1)
      @datap.read(1)
      @controlp.flush
      @datap.flush
      @controlp.write(0)
      @datap.write(0)
      return 0
    end
  end
end
<snip>

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